Sig Sauer BDX is the newest in electro-optics technology. BDX or Ballistic Data Xchange technology is found in the new Sierra3BDX riflescopes and KiloBDX rangefinders. To get the most out of your BDX products you can also download the SIG SAUER BDX app on Android and Apple devices and receive information via Bluetooth. The BDX allows for both accuracy and simplicity. DownloadsSig Sauer Product Catalog 2020Download Sig Sauer BDX Combo Kit, Kilo1600BDX LRF and Sierra3BDX Rifle Scope, 4.5-14x50mm SOK16BDX04